Method for selecting resource for V2X communication by terminal in wireless communication system, and terminal using same method

Abstract

The present disclosure provides a method for selecting a resource for vehicle-to-everything (V2X) communication by a terminal in a wireless communication system, and a terminal using the method. The method comprises: determining a threshold by measuring a resource during a first time period; determining a resource state in a second time period on the basis of the threshold; and selecting a resource for V2X communication during the second time period on the basis of a determination result.

What is claimed is: 
     
       1. A method of selecting a resource of a terminal for vehicle-to-everything (V2X) communication in a wireless communication system, the method comprising:
 determining a threshold by measuring a received signal strength indicator (RSSI) in each of candidate resources for the V2X communication during a first time interval; 
 determining a resource status in a second time interval based on the threshold; and 
 selecting a resource for the V2X communication in the second time interval based on the determination result, 
 wherein the threshold is determined as a value corresponding to lower X (X is a natural number) % among RSSI values measured for each of the candidate resources. 
 
     
     
       2. The method of  claim 1 , wherein a value of the X is determined according to a priority of each packet, delay requirement, reliability, or a service type of data to be transmitted through the V2X communication. 
     
     
       3. The method of  claim 1 , wherein the resource status is one of an idle state and a busy state. 
     
     
       4. The method of  claim 1 , wherein in a time domain, the second time interval is located after the first time interval. 
     
     
       5. The method of  claim 1 , wherein a resource for the V2X communication is selected in a random manner in the second time interval, when the resource status is idle. 
     
     
       6. The method of  claim 5 , wherein the resource selected in the random manner is periodically re-evaluated, but when a resource status of the selected resource is determined to idle in the periodic re-evaluation process, a counter value is decreased, and when the counter value becomes 0, the V2X communication is performed using the selected resource. 
     
     
       7. The method of  claim 6 , wherein the counter value is maintained, when a resource status of the selected resource is determined to busy in the periodic re-evaluation process. 
     
     
       8. The method of  claim 1 , wherein the first time interval is determined based on the second time interval. 
     
     
       9. The method of  claim 1 , wherein the threshold is determined dependently on traffic transmission of other terminals in the first time interval. 
     
     
       10. A user equipment (UE), comprising:
 a transceiver for transmitting and receiving wireless signals; and 
 a processor for operating in combination with the transceiver, 
 wherein the processor is configured to: 
 determine a threshold by measuring received signal strength indicator (RSSI) in each of candidate resources for the V2X communication during a first time interval, determine a resource status in a second time interval based on the threshold, and select a resource for V2X communication in the second time interval based on the determination result 
 wherein the threshold is determined as a value corresponding to lower X (X is a natural number) % among RSSI values measured for each of the candidate resources. 
 
     
     
       11. The UE of  claim 10 , wherein a value of the X is determined according to a priority of each packet, delay requirement, reliability, or a service type of data to be transmitted through the V2X communication. 
     
     
       12. The UE of  claim 10 , wherein the resource status is one of an idle state and a busy state. 
     
     
       13. The UE of  claim 10 , wherein in a time domain, the second time interval is located after the first time interval. 
     
     
       14. The UE of  claim 10 , wherein a resource for the V2X communication is selected in a random manner in the second time interval, when the resource status is idle. 
     
     
       15. The UE of  claim 14 , wherein the resource selected in the random manner is periodically re-evaluated, but when a resource status of the selected resource is determined to idle in the periodic re-evaluation process, a counter value is decreased, and when the counter value becomes 0, the V2X communication is performed using the selected resource. 
     
     
       16. The UE of  claim 15 , wherein the counter value is maintained, when a resource status of the selected resource is determined to busy in the periodic re-evaluation process. 
     
     
       17. The UE of  claim 10 , wherein the first time interval is determined based on the second time interval. 
     
     
       18. The UE of  claim 10 , wherein the threshold is determined dependently on traffic transmission of other terminals in the first time interval.